Well, doggone if I don't need a good guide here. Running Mac OSX 10.5.9 (Intel). Need to convert epubs (on Desktop in folder EPubs_Uploaded) into mobi. Downloaded KindleGen, put it in Home directory as Liz Castro instructed. Now I'm lost in the wilderness. Got a good flashlight, anyone?

KindleGen for Mac:
1. Download the KindleGen.zip to your Mac in a location such as your home (~) directory.
2. Unzip it under '~/KindleGen'
3. Open a command prompt and type '~/KindleGen/kindlegen'.
4. You will see instructions on how to run KindleGen.
5. To convert a file called book.html, go to the directory where the book is present, eg. 'cd Desktop' and all you have to do now is type '~/KindleGen/kindlegen book.html' and if successful, you will see a successful conversion and a new file on your Desktop called book.mobi.
Please note: It is recommended to follow these steps to run KindleGen. Double-clicking the KindleGen icon does not launch this program. Run the above commands without quotes.

Edit: I have a PC kicking around here which I run the Kindlegen on, I find it alot easier to use...IMO

Adjust, thanks for the response. I did follow that path, highlighting the folder ("directory") within Home that contains the epub I want to convert, then opening Terminal I ran that command, but all I could get was that it recognized the KindleGen was a directory. No further action. That's why I need a "click here, dummy" kind of guideline.